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<h1 style="color: #444444; font-size: 72px; text-shadow: 0px 0px 12px #ffd000;">钱学森之问A<small>——总能试出答案</small></h1>
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<p class="text-success" style="text-align: right;">Current Progress: 1 / 10</p>
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<p>某机构有一条高速专线，除了日常上网，异地备份也使用这条线。这存在什么安全问题？</p>
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  <span class="input-group-addon"><input type="radio" name="prob1" value="1"/></span><span class="form-control">单一故障点　　</span>
  <span class="input-group-addon"><input type="radio" name="prob1" value="2"/></span><span class="form-control">冗余连接　　　</span>
  <span class="input-group-addon"><input type="radio" name="prob1" value="3"/></span><span class="form-control">备用电源的需要</span>
  <span class="input-group-addon"><input type="radio" name="prob1" value="4"/></span><span class="form-control">异地备份的存储</span>
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<p>你在数据库服务器中发现了 Rootkit 病毒。最好的修复方法是？</p>
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  <span class="input-group-addon"><input type="radio" name="prob2" value="1"/></span><span class="form-control">重新搭建服务器　　　　　　</span>
  <span class="input-group-addon"><input type="radio" name="prob2" value="2"/></span><span class="form-control">运行反病毒软件　　　　　　</span>
  <span class="input-group-addon"><input type="radio" name="prob2" value="3"/></span><span class="form-control">安装基于主机的入侵检测系统</span>
  <span class="input-group-addon"><input type="radio" name="prob2" value="4"/></span><span class="form-control">安装补丁　　　　　　　　　</span>
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<p>如果用户不够警觉，可能受到什么攻击？</p>
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  <span class="input-group-addon"><input type="radio" name="prob3" value="1"/></span><span class="form-control">中间人攻击　</span>
  <span class="input-group-addon"><input type="radio" name="prob3" value="2"/></span><span class="form-control">反向哈希匹配</span>
  <span class="input-group-addon"><input type="radio" name="prob3" value="3"/></span><span class="form-control">物理入侵　　</span>
  <span class="input-group-addon"><input type="radio" name="prob3" value="4"/></span><span class="form-control">社会工程学　</span>
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<p>黑客和研究者可以通过什么方法发现软件的未知漏洞？</p>
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  <span class="input-group-addon"><input type="radio" name="prob4" value="1"/></span><span class="form-control">字典攻击　　</span>
  <span class="input-group-addon"><input type="radio" name="prob4" value="2"/></span><span class="form-control">模糊探测　　</span>
  <span class="input-group-addon"><input type="radio" name="prob4" value="3"/></span><span class="form-control">战争游击　　</span>
  <span class="input-group-addon"><input type="radio" name="prob4" value="4"/></span><span class="form-control">跨站伪造请求</span>
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<p>下面哪个不是对抗跨站脚本注入XSS的方法？</p>
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  <span class="input-group-addon"><input type="radio" name="prob5" value="1"/></span><span class="form-control">输入检测　　</span>
  <span class="input-group-addon"><input type="radio" name="prob5" value="2"/></span><span class="form-control">守护代码　　</span>
  <span class="input-group-addon"><input type="radio" name="prob5" value="3"/></span><span class="form-control">允许脚本输入</span>
  <span class="input-group-addon"><input type="radio" name="prob5" value="4"/></span><span class="form-control">字符重编码　</span>
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<p>下面哪个支持完美的前向安全性？</p>
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  <span class="input-group-addon"><input type="radio" name="prob6" value="1"/></span><span class="form-control">PBKDF2</span>
  <span class="input-group-addon"><input type="radio" name="prob6" value="2"/></span><span class="form-control">ECDHE </span>
  <span class="input-group-addon"><input type="radio" name="prob6" value="3"/></span><span class="form-control">HMAC  </span>
  <span class="input-group-addon"><input type="radio" name="prob6" value="4"/></span><span class="form-control">OCSP  </span>
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